/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Project  : WebQQCore
 * Package  : iqq.im.event
 * File     : QQNotifyHandlerProxy.java
 * Author   : solosky < solosky772@qq.com >
 * Created  : 2013-3-16
 * License  : Apache License 2.0 
 */
package iqq.im.event;

import iqq.im.QQNotifyListener;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

/**
 * 使用这个类简化事件的注册，分发 只需在被代理的类使用@IMEventHandler注解需要处理的事件类型即可
 * 
 * @author solosky <solosky772@qq.com>
 */
public class QQNotifyHandlerProxy implements QQNotifyListener {
    private static final Logger LOG = Logger.getLogger(QQNotifyHandlerProxy.class);
    private Object proxyObject;
    private Map<QQNotifyEvent.Type, Method> methodMap;

    public QQNotifyHandlerProxy(Object proxyObject) {
        this.proxyObject = proxyObject;
        this.methodMap = new HashMap<QQNotifyEvent.Type, Method>();
        for (Method m : proxyObject.getClass().getDeclaredMethods()) {
            if (m.isAnnotationPresent(QQNotifyHandler.class)) {
                QQNotifyHandler handler = m.getAnnotation(QQNotifyHandler.class);
                this.methodMap.put(handler.value(), m);
                if (!m.isAccessible()) {
                    m.setAccessible(true);
                }
            }
        }
    }

    public void onNotifyEvent(QQNotifyEvent event) {
        Method m = methodMap.get(event.getType());
        if (m != null) {
            try {
                m.invoke(proxyObject, event);
            } catch (Throwable e) {
                LOG.warn("invoke QQNotifyHandler Error!!", e);
            }
        } else {
            LOG.warn("Not found QQNotifyHandler for QQNotifyEvent = " + event);
        }
    }

}
